Nice job of documentation. The DLW typically stencilled the caboose number on the center sill of the car, did you happen to see any numbers there?
There are some "passenger" cars in the NJMT collection at Allaire that were constructed out of DL&W Caboose Frames (the carbody was completely cut down to the frame during the conversion). These cars were put together back in either the late 60's or early 70's at the Carroll Park & Western tourist RR in central Pennsylvania, eventually were used as a display at a shoppping center parking lot in Ocean County, then were donated to the NJMT/Pine Creek folks. The stencilled numbers are still visible on the sills.
Also, RRRR #10, an ex NH car, still exists - it is owned by the Tri-STate Railway Historical Society (based in Morristown) and is in the process of being restored. Last time I checked it was parked on the side track at Port Murray (West of Hackettstown on the NS Washington Secondary).